/*******************************************************************************
 * Copyright (c) 2016, Institute for Pervasive Computing, ETH Zurich.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * This file is part of the Copper (Cu) CoAP user-agent.
 ******************************************************************************/
 
Copper.TimeUtils = function(){
};

Copper.TimeUtils.now = function(){
	return Date.now ? Date.now() : new Date().getTime();
};

/*
* @return true if @timestamp is older than @milliseconds
*/
Copper.TimeUtils.isOlderThan = function(timestamp, milliseconds){
	if (!Number.isInteger(timestamp) || timestamp < 0 || !Number.isInteger(milliseconds) || milliseconds < 0){
		throw new Error("Illegal argument");
	}
	return Copper.TimeUtils.now() - timestamp > milliseconds;
};

/*
* set a @callback that will be called in @milliseconds
* @return ID which can be used to clear the timeout
*/
Copper.TimeUtils.setTimeout = function(callback, milliseconds) {
	return window.setTimeout(callback, milliseconds);
};

/*
* Clear a previously set timeout
*/
Copper.TimeUtils.clearTimeout = function(timeoutId){
	return window.clearTimeout(timeoutId);
};